After a half-hour stroll through the Botanic Gardens, Julian found the perfect hilltop for the day’s project. He spread his picnic blanket with a flourish, and set about unpacking his flowers from the basket hooked under his arm. After weeks of careful cultivation, he was even more careful to arrange the blooms across his blanket: first by color, and then by size. Once laid out to his satisfaction he could remove the final pieces from his basket — a spool of wire, and an ornate...